JPH08312380A - Fuel limiter of internal combustion engine - Google Patents

Abstract

PURPOSE: To prevent a limit bolt, limiting fuel so as not to be supplied to an engine as far as more than a certain value, from being altered with a simple usual tool or the like, in this internal combustion engine of a diesel engine and the like. CONSTITUTION: In a diesel engine and the like, a fuel limiter to be set up in a fuel supply system in order to limit a supply fuel quantity to less than a certain fixed value is constituted to be limited by the projected variable of a limit bolt B to be screwed in an internal combustion engine body N. A tubular collar 2 provided with a tubular part covering an outer boundary of the limit bolt B is held between this engine body N and a clamping nut 3 on the outer boundary of this limit bolt B as the constitution.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention, in an internal combustion engine such as a diesel engine, prevents a limiting bolt for limiting the supply of fuel above a certain value from being modified by simple daily tools. It is a thing.

[0002]

2. Description of the Related Art Conventionally, a technique relating to a fuel limiting device for an internal combustion engine such as a diesel engine has been known. For example, it is like the technique described in Japanese Patent Laid-Open No. 6-336963 or Japanese Utility Model Laid-Open No. 4-84732.

In the technique disclosed in Japanese Patent Laid-Open No. 6-336963, the cylindrical cap is press-fitted in a state in which it is in contact with a detent means such as the outer surface of the pump housing, so that the rotational removal is impossible. , It is impossible to re-adjust the limit bolt and make alterations. However, even in the case of this tubular cap, since a fixed wall such as a pump housing is required, there is a restriction on the mounting position and there is no degree of freedom in design. Further, in the technique disclosed in Japanese Utility Model Laid-Open No. 4-84732, the guide cylinder is put on the limiting bolt,
The cap was deformed so that it could not be removed, and it was prevented from being altered by adjusting the rotation of the limiting bolt. However, even in this structure, it was possible to attach / detach with a normal tool to some extent, and the structure could be modified.

[0004]

Due to the characteristics of the diesel engine, the output of the diesel engine is adjusted by limiting the maximum injection amount of the fuel injection pump under excessive air. The maximum injection amount of this fuel injection pump affects not only the output of the engine but also the emission amount of air pollutants contained in the exhaust gas, such as nitrogen oxides and particulates. You need to ensure that you are limited by state. Therefore,
It is necessary to ensure that the limiting bolt cannot be removed with a simple normal tool. The present invention is constructed such that such a limiting bolt cannot be removed with a normal tool even if it is wrong.

[0005]

The problems to be solved by the present invention are as described above. Next, the means for solving the problems will be described. In the first aspect of the present invention, in the internal combustion engine, in order to limit the supplied fuel amount to a certain limit or less,
The fuel limiting device arranged in the fuel supply system is configured to be limited by the protruding amount of the limiting bolt B screwed on the internal combustion engine body N, and the special tool engagement hole 3a on the outer periphery of the internal combustion engine body N and the limiting bolt B is formed. The tubular collar 2 having the tubular portion 2a covering the outer periphery of the limiting bolt B was sandwiched between the fastening nut 3 and the fastening nut 3.

According to a second aspect, in the internal combustion engine,
In order to limit the supplied fuel amount to a certain limit or less, the fuel limiting device arranged in the fuel supply system is configured to be limited by the protruding amount of the limiting bolt B screwed on the internal combustion engine body N,
The internal combustion engine body N is provided around the fastening nut 3 of the control bolt.
Further, the tubular portion 4 is provided so as to project, and the inlet portion of the tubular portion 4 is configured to be closed by the closing plug 1.

According to claim 3, in the internal combustion engine,
In order to limit the supplied fuel amount to a certain limit or less, the fuel limiting device arranged in the fuel supply system is configured to be limited by the protruding amount of the limiting bolt B screwed on the internal combustion engine body N,
The internal combustion engine body N is provided around the fastening nut 3 of the control bolt.
The tubular portion 4 is protruded, and the inlet portion of the tubular portion 4 is configured to be closed by the closing plug 1, and the closing plug 1 is provided with the shearable engaging portion 6 that is removed after the attachment.

According to claim 4, in the internal combustion engine,
In order to limit the supplied fuel amount to a certain limit or less, the fuel limiting device arranged in the fuel supply system is configured to be limited by the protruding amount of the limiting bolt B screwed on the internal combustion engine body N,
The internal combustion engine body N is provided around the fastening nut 3 of the control bolt.
The tubular portion 4 is projectingly provided, and the inlet portion of the tubular portion 4 is configured to be closed by the closing plug 1. The closing plug 1 is provided with the locking portion 5 only in the tightening direction.

[0009]

Since the present invention is constructed as described above, it operates as follows. Body (eg cylinder block)
After the limiting bolt B is screwed on and the optimum position of the limiting bolt B is selected, the fastening nut 3 is used to tighten the limiting bolt B.
The position of is fixed so that it is not changed. In the present invention, the tubular covering portion 2 float-supported is fitted around the fastening nut 3 so that the fastening nut 3 cannot rotate from the outside. A closing plug 1 is provided at the inlet of the tubular covering 2 to close it so that a normal tool cannot be inserted.

Further, the tubular covering portion 2 may be of a collar type sandwiched between the internal combustion engine body N and the fastening nut 3, or the tubular portion 4 integrally protruding from the internal combustion engine body N. Is also good. Further, the closing plug 1 that closes the inlet of the tubular collar 2 or the tubular portion 4 may be a fitting-fixing type closing plug 1 that is simply inserted, or as a type that is screwed and fixed. When screwing, the nut portion for screwing is used as the shearable engaging portion 6, and after screwing the closing plug 1, this portion is sheared.
After that, the closure plug 1 was constructed so as not to rotate. Alternatively, the closing plug 1 itself is provided with the locking portion 5 only in the tightening direction so that the tightening operation can be performed but the removal operation cannot be performed.

[0011]

EXAMPLES Examples of the present invention will be described below. 1 is a side view of a diesel engine showing a fuel limiting device for an internal combustion engine and a governor mechanism of the present invention, FIG. 2 is a sectional view taken along the line AA of FIG. 1 showing the governor mechanism, and FIG. 4 is a governor stopper portion. FIG. 4 is a cross-sectional view showing a structure in which the cylindrical covering portion 2 formed separately is sandwiched between the internal combustion engine body N and the fastening nut 3, and FIG. 5 is a side view of FIG. 6 is a cross-sectional view of a configuration in which the tubular portion 4 is integrally projected from the internal combustion engine body N to cover the periphery of the fastening nut 3 and the closing plug 1 is fitted into the next inlet portion, and FIG. A side view, FIG. 8 is a cross-sectional view showing a configuration in which a shearable engagement portion 6 is provided in the closing plug 1 that closes the inlet portion of the tubular portion 4, and FIG. FIG. 10 is a side view of a portion, and shows a configuration in which the locking portion 5 is provided in the closing plug 1 only in the tightening direction. Rear view, FIG. 11 is a side view of a structure in which a locking portion 5 only in the same tightening direction.

1, 2 and 3, the overall construction of the fuel limiting device for a diesel engine will be described. The governor mechanism has a governor gear 20 and a governor weight 2.
1, a governor spindle 22, a governor lever shaft 29, a governor lever 28 and the like. On the governor lever shaft 29, a governor lever 28 is fixed inside the cylinder block, and a regulator lever 14 is fixed outside the cylinder block.
At the other end of the governor lever 28, the fuel injection pump P
The regulator pin 18 of is fitted. The fuel injection pump P is driven by a fuel injection cam 27.

The regulator lever 1 fixed to the governor lever shaft 29 is provided outside the cylinder block.
4 is arranged, and a regulator handle 23 that rotates in conjunction with the regulator lever 14 is arranged. The regulator handle 23 is provided with a high idle limiter mechanism 12 that controls idle rotation so that the high idle limiter mechanism 12 can come into contact with the regulator handle 23. Between the regulator handle 23 and the regulator lever 14, the regulator spring 16
Is interposed. The limiting bolt B of the present invention is configured to contact the regulator lever 14 on the outside of the cylinder block.

This will be described with reference to FIGS. 4 and 5. In this structure, an internal combustion engine body N integrally formed with the cylinder block is provided in a protruding manner. A limit bolt B is screwed into the internal combustion engine body N, the position of the regulator lever 14 is determined by the protruding amount of the limit bolt B, and the rotation limit value of the regulator lever 14 is set to the governor lever shaft 29.
This limits the amount of protrusion of the governor spindle 22. As a result, the rotation angle of the governor lever 28 is regulated, and the discharge amount of the fuel injection pump P is regulated.

After the projection amount of the limiting bolt B is determined, the fastening nut 3 is positioned, and the tubular collar 2 is provided on the outer periphery of the fastening nut 3 in a float shape. The tubular collar 2 covers the periphery of the fastening nut 3 and projects more than the fastening nut 3, so that the inlet portion of the fastening nut 3 can be closed by the closing plug 1. The closing plug 1 is
In the embodiment of FIGS. 4 and 5, it is configured to be fitted and fixed without being screwed. Further, the fastening nut 3 is a special tool, and a special tool engagement hole 3a is formed so as to be rotatable. Further, a biasing spring 7 for preventing rotation of the tubular collar 2 is interposed between the fastening nut 3 and the closing plug 1.

In FIGS. 6 and 7, the tubular collar 2 which is constructed separately from the internal combustion engine body in the configuration of FIGS. 4 and 5 is integrally projected with the internal combustion engine body N. It is configured as a cylindrical portion 4 that has been formed. The point that a special tool engagement hole 3a is formed in the fastening nut 3 is the same. Also in the configurations of FIGS. 6 and 7, the closing plug 1 is made of a synthetic resin or an iron plate and is fitted so that it cannot be pulled out by a normal tool after the fitting.

The embodiment shown in FIG. 8 discloses a configuration in which two configurations of the high idle limiter mechanism 12 and the limiting bolt B are arranged side by side. The high idle limiter mechanism 12 is provided with a fastening nut 11, and the fastening nut 11
The outer periphery of is covered with a tubular portion 10. The tubular portion 11
A closing plug 9 is provided at the entrance of the closing plug 9, and a shearable engaging portion 8 is provided at the closing plug 9. Similarly, the limiting bolt B screwed to the internal combustion engine body N is fixed by the fastening nut 3, the tubular portion 4 is projected around the fastening nut 3, and the inlet of the tubular portion 4 is closed by the plug 1. And the closure plug 1 is provided with a shearable engagement portion 6.

The shearable engagement portion 6 is used only for tightening the closure plug 1. After the closure plug 1 is tightened, the shearable engagement portion 6 is sheared by strongly tightening it with a spanner. It is. Therefore, thereafter, there is no method of loosening the plug 1 by rotating it in reverse.

In the embodiment shown in FIGS. 10 and 11,
The locking plug 1 for closing the inlet of the tubular portion 4 is provided with a locking portion 5 only in the tightening direction. The locking portion 5 only in the tightening direction constitutes a concave portion that is inclined and engaged only in the tightening direction, and there is no locking portion in the opposite direction to loosen the closing plug 1.

[0020]

Since the present invention is constructed as described above, it has the following effects. According to the first aspect of the present invention, in the conventional fuel limiter for an internal combustion engine, there is a case where the seal can be easily unsealed with a normal tool. Since the tubular collar 2 is sandwiched between the fastening nut 3 having the fitting hole 3a and the internal combustion engine body N, the fastening nut 3 cannot be removed with a simple ordinary tool, and the tubular collar 2 is Since it is supported in a float shape, the fastening nut 3 cannot be removed via the tubular collar 2, and the fuel restriction state cannot be easily modified. Further, since the cylindrical collar 2 is separate from the internal combustion engine body N, it can be retrofitted. Further, since the inlet portion is closed by the closing plug 1, the closing plug 1 cannot be removed with a normal tool,
The effect is that the seal cannot be easily removed.

Since the tubular collar portion is integrally formed with the internal combustion engine body N to form the tubular portion 4, as in claim 2,
Since the tubular portion 4 can be easily manufactured, and it is not necessary to assemble the tubular collar, and the fastening nut 3 can be rotated only by a special tool, the operation of opening the closing plug 1 and the fastening nut 3 can be performed. It is possible to have a double sealing structure for rotating the.

According to a third aspect of the present invention, the closure plug 1 is provided with the shearable engagement portion 6, and the shearable engagement portion 6 is provided in the closure plug 1.
After screwing, it can be sheared by strongly rotating it with a spanner, so that there is no means for loosening the closing plug 1 thereafter, and the method for opening the seal can be eliminated.

Since the closing plug 1 is provided with the engaging portion 5 only in the tightening direction, the closing plug 1 can rotate in the tightening direction only in the tightening direction. However, since it cannot rotate in the loosening direction, it was impossible to seal it.

[Brief description of drawings]

FIG. 1 is a side view of a diesel engine showing a fuel limiting device and a governor mechanism of an internal combustion engine according to the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG. 1 showing a governor mechanism.

FIG. 3 is a sectional view of a governor stopper portion.

FIG. 4 is a cross-sectional view showing a configuration in which a cylindrical covering portion 2 configured separately is sandwiched between an internal combustion engine body N and a fastening nut 3.

FIG. 5 is a side view of FIG.

FIG. 6 is a cross-sectional view of a configuration in which a tubular portion 4 is integrally projected from the internal combustion engine body N to cover the periphery of the fastening nut 3 and a closing plug 1 is fitted in the next inlet portion.

FIG. 7 is a side view of FIG.

FIG. 8 is a cross-sectional view showing a configuration in which a shearable engagement portion 6 is provided in a closing plug 1 that closes an inlet portion of a tubular portion 4.

FIG. 9 is a side view of the closing plug 1 and the shearable engagement portion 6 of the same.

FIG. 10 is a cross-sectional view showing a configuration in which a locking portion 5 is provided in the closing plug 1 only in the tightening direction.

FIG. 11 is a side view of a structure in which the locking portion 5 is provided only in the tightening direction.

[Explanation of symbols]

 B Limiting bolt N Internal combustion engine body 1 Closing plug 2 Cylindrical collar 3 Fastening nut 4 Cylindrical part 5 Locking part 6 Shearable engaging part

Claims (4)

[Claims] 1. In an internal combustion engine, a limiting bolt B having a fuel limiting device arranged in a fuel supply system screwed on an internal combustion engine main body N so as to limit the amount of supplied fuel to a certain limit or less.
Of the internal combustion engine main body N and the fastening nut 3 having the special tool engagement hole 3a on the outer periphery of the limiting bolt B formed therein so as to cover the outer periphery of the limiting bolt B. A fuel limiting device for an internal combustion engine, characterized in that a tubular collar (2) having a shaped portion (2a) is sandwiched. 2. In an internal combustion engine, a fuel limiting device arranged in a fuel supply system for limiting the supplied fuel amount to a certain limit or less is provided with a limiting bolt B screwed to an internal combustion engine body N.
Of the control bolt, a tubular portion 4 is provided so as to project from the internal combustion engine body N, and the inlet portion of the tubular portion 4 is closed by the closing plug 1. A fuel limiting device for an internal combustion engine, which is configured as described above. 3. In an internal combustion engine, a limiting bolt B having a fuel limiting device arranged in a fuel supply system screwed on an internal combustion engine body N so as to limit the amount of supplied fuel to a certain limit or less.
Of the control bolt, a tubular portion 4 is provided so as to project from the internal combustion engine body N, and the inlet portion of the tubular portion 4 is closed by the closing plug 1. A fuel limiting device for an internal combustion engine, characterized in that the closing plug 1 is provided with a shearable engaging portion 6 that is removed after being attached. 4. In an internal combustion engine, a limiting bolt B having a fuel limiting device arranged in a fuel supply system screwed on an internal combustion engine body N in order to limit the amount of fuel supplied to a certain limit or less.
Of the control bolt, a tubular portion 4 is provided so as to project from the internal combustion engine body N, and the inlet portion of the tubular portion 4 is closed by the closing plug 1. A fuel limiting device for an internal combustion engine, characterized in that the closing plug 1 is provided with a locking portion 5 only in the tightening direction.